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riscv: implement arch_switch()

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The move to arch_switch() is a prerequisite for SMP support.

Make it optimal without the need for an ECALL roundtrip on every
context switch. Performance numbers from tests/benchmarks/sched:

Before:
unpend  107 ready  102 switch  188 pend  218 tot  615 (avg  615)

After:
unpend  107 ready  102 switch  170 pend  217 tot  596 (avg  595)

Signed-off-by: Nicolas Pitre <npitre@baylibre.com>
This commit is contained in:
Nicolas Pitre 2022-03-07 17:01:36 -05:00 • committed by Anas Nashif
commit ce8dabfe9e
12 changed files with 197 additions and 234 deletions
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38
tests/subsys/logging/log_stack/src/main.c
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@ -141,9 +141,9 @@ ZTEST_SUITE(test_log_stack, NULL, NULL, NULL, NULL, after);
#elif defined(CONFIG_RISCV) && !defined(CONFIG_64BIT) && !defined(CONFIG_SMP)
#if !defined(CONFIG_LOG_MODE_IMMEDIATE) && !defined(CONFIG_NO_OPTIMIZATIONS)
#define SIMPLE_USAGE 24
#define HEXDUMP_USAGE 60
#define MORE_ARGS_USAGE 40
#define SIMPLE_USAGE 36
#define HEXDUMP_USAGE 84
#define MORE_ARGS_USAGE 52
#elif defined(CONFIG_LOG_MODE_IMMEDIATE) && !defined(CONFIG_NO_OPTIMIZATIONS)
#define SIMPLE_USAGE 456
#define HEXDUMP_USAGE 456
@ -181,33 +181,33 @@ ZTEST_SUITE(test_log_stack, NULL, NULL, NULL, NULL, after);
#elif defined(CONFIG_RISCV) && defined(CONFIG_64BIT) && defined(CONFIG_SMP)
#if !defined(CONFIG_LOG_MODE_IMMEDIATE) && !defined(CONFIG_NO_OPTIMIZATIONS)
#define SIMPLE_USAGE 24
#define HEXDUMP_USAGE 60
#define MORE_ARGS_USAGE 48
#define SIMPLE_USAGE 80
#define HEXDUMP_USAGE 96
#define MORE_ARGS_USAGE 112
#elif defined(CONFIG_LOG_MODE_IMMEDIATE) && !defined(CONFIG_NO_OPTIMIZATIONS)
#define SIMPLE_USAGE 656
#define HEXDUMP_USAGE 656
#define MORE_ARGS_USAGE 688
#define SIMPLE_USAGE 688
#define HEXDUMP_USAGE 688
#define MORE_ARGS_USAGE 720
#elif !defined(CONFIG_LOG_MODE_IMMEDIATE) && defined(CONFIG_NO_OPTIMIZATIONS)
#define SIMPLE_USAGE 240
#define HEXDUMP_USAGE 240
#define MORE_ARGS_USAGE 240
#define SIMPLE_USAGE 272
#define HEXDUMP_USAGE 272
#define MORE_ARGS_USAGE 272
#elif defined(CONFIG_LOG_MODE_IMMEDIATE) && defined(CONFIG_NO_OPTIMIZATIONS)
#define SIMPLE_USAGE 992
#define HEXDUMP_USAGE 1408
#define HEXDUMP_USAGE 992
#define MORE_ARGS_USAGE 1024
#endif
#elif defined(CONFIG_RISCV) && defined(CONFIG_64BIT)
#if !defined(CONFIG_LOG_MODE_IMMEDIATE) && !defined(CONFIG_NO_OPTIMIZATIONS)
#define SIMPLE_USAGE 16
#define HEXDUMP_USAGE 32
#define MORE_ARGS_USAGE 48
#define SIMPLE_USAGE 104
#define HEXDUMP_USAGE 144
#define MORE_ARGS_USAGE 136
#elif defined(CONFIG_LOG_MODE_IMMEDIATE) && !defined(CONFIG_NO_OPTIMIZATIONS)
#define SIMPLE_USAGE 616
#define HEXDUMP_USAGE 616
#define MORE_ARGS_USAGE 648
#define SIMPLE_USAGE 704
#define HEXDUMP_USAGE 704
#define MORE_ARGS_USAGE 736
#elif !defined(CONFIG_LOG_MODE_IMMEDIATE) && defined(CONFIG_NO_OPTIMIZATIONS)
#define SIMPLE_USAGE 272
#define HEXDUMP_USAGE 272